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Allow implementation-defined behaviour for constraining leap months

This commit is contained in:
André Bargull 2024-05-29 14:18:19 +02:00 committed by Philip Chimento
parent e7d9c0d698
commit dcaed0523c
1 changed files with 22 additions and 1 deletions
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23
test/intl402/Temporal/PlainYearMonth/from/reference-day-chinese.js
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@ -33,13 +33,34 @@ const months2022TestData = [
["M11", 11, 24],
["M12", 12, 23],
];
for (const [nonLeapMonthCode, month, referenceISODay] of months2022TestData) {
for (let [nonLeapMonthCode, month, referenceISODay] of months2022TestData) {
// Allow implementation-defined "epoch year" for the Chinese calendar.
const year = new Temporal.PlainDate(2022, 3, 1).withCalendar("chinese").year;
const leapMonthCode = nonLeapMonthCode + "L";
const fields = { year, monthCode: leapMonthCode, calendar: "chinese" };
const result = Temporal.PlainYearMonth.from(fields, { overflow: "constrain" });
// CalendarDateToISO ( calendar, fields, overflow )
//
// > If the month is a leap month that doesn't exist in the year, pick another
// > date according to the cultural conventions of that calendar's users.
// > Usually this will result in the same day in the month before or after
// > where that month would normally fall in a leap year.
//
// Without clear information in which direction the month has to be adjusted,
// we have to allow two possible implementations:
// 1. The previous month is used, i.e. "M01L" is constrained to "M01".
// 2. The next month is used, i.e. "M01L" is constrained to "M02".
if (result.month !== month) {
assert.sameValue(result.month, month + 1);
// Adjust nonLeapMonthCode, month, referenceISODay using the data from the
// next month.
const nextMonth = months2022TestData.find(e => e[1] === month + 1);
[nonLeapMonthCode, month, referenceISODay] = nextMonth;
}
TemporalHelpers.assertPlainYearMonth(
result,
year, month, nonLeapMonthCode,